minor README.md updates

Signed-off-by: Petter Mabäcker <petter@technux.se>
pep8 fixes

Fix the following pep8 issues:
redmine_interface.py:21:80: E501 line too long (95 > 79 characters)
redmine_interface_test.py:9:11: E225 missing whitespace around operator
redmine_interface_test.py:13:1: E302 expected 2 blank lines, found 1

Also add hint to console printout about what might be needed if Redmine
support is not enabled.

Signed-off-by: Petter Mabäcker <petter@technux.se>
ircbot.py: graceful shutdown on ctrl+c

If ctrl+c is sent to the bot, catch it and allow the bot
to disconnect and shutdown gracefully.

Signed-off-by: Petter Mabäcker <petter@technux.se>
ircbot.py: add send_priv_msg()

The added function sends message only to nick

Signed-off-by: Petter Mabäcker <petter@technux.se>